72 Ambiguous copysign(Ambiguous, Ambiguous){ return Ambiguous(); }  in copysign()  function
788     static_assert((std::is_same<decltype(std::copysign((float)0, (float)0)), float>::value), "");  in test_copysign()
789     static_assert((std::is_same<decltype(std::copysign((bool)0, (float)0)), double>::value), "");  in test_copysign()
790 …static_assert((std::is_same<decltype(std::copysign((unsigned short)0, (double)0)), double>::value)…  in test_copysign()
791 …static_assert((std::is_same<decltype(std::copysign((int)0, (long double)0)), long double>::value),…  in test_copysign()
792 …static_assert((std::is_same<decltype(std::copysign((float)0, (unsigned int)0)), double>::value), "…  in test_copysign()
793     static_assert((std::is_same<decltype(std::copysign((double)0, (long)0)), double>::value), "");  in test_copysign()
794 …static_assert((std::is_same<decltype(std::copysign((long double)0, (unsigned long)0)), long double…  in test_copysign()
795     static_assert((std::is_same<decltype(std::copysign((int)0, (long long)0)), double>::value), "");  in test_copysign()
796 …static_assert((std::is_same<decltype(std::copysign((int)0, (unsigned long long)0)), double>::value…  in test_copysign()
797     static_assert((std::is_same<decltype(std::copysign((double)0, (double)0)), double>::value), "");  in test_copysign()
798 …static_assert((std::is_same<decltype(std::copysign((long double)0, (long double)0)), long double>:…  in test_copysign()
799     static_assert((std::is_same<decltype(std::copysign((float)0, (double)0)), double>::value), "");  in test_copysign()
800 …static_assert((std::is_same<decltype(std::copysign((float)0, (long double)0)), long double>::value…  in test_copysign()
801 …static_assert((std::is_same<decltype(std::copysign((double)0, (long double)0)), long double>::valu…  in test_copysign()
804     static_assert((std::is_same<decltype(std::copysign((int)0, (int)0)), double>::value), "");  in test_copysign()
805 … static_assert((std::is_same<decltype(copysign(Ambiguous(), Ambiguous())), Ambiguous>::value), "");  in test_copysign()
806     assert(std::copysign(1,1) == 1);  in test_copysign()